http://www.programmingisnothard.com/bootcamps
A few things I noticed (through just a quick inspection):
1) Average training time is about 10 weeks;
2) 28 out of 50 teaches Ruby/Rails, 15 out of 50 teaches JavaScript, 5 teaches Python, 3 teaches iOS, and 3 teaches Android.
So, yeah, the curriculum is pretty practical. I doubt many of the curriculums cares about C.S. basics as long as it is enough to let them write Rails code.
I think one way to filter out the inept students is may be let them do some algorithm problems during interview? Also if your company does Ruby, then let a part of interview process be solving the bugs or issues on company's current project, and try to see how to approach the problem and whether can get it done. Understanding other people's code and reproducing/tracing/fixing bug is something very important. Also a big thing is when a bootcamp grad candidate say "you should do X in Rails", probably ask them why is a good idea. Do they do X just because their teachers say so, or there is a good reason for really doing so.
Disclaimer: don't have any experience with any bootcamp grad, but with experience working with X (place Rails, Django, etc. here) only guys.